Leakage Proof Cooling Jacket Heaters are 60% open by perforated metal sheet and have a blower cover for mounting the blower. These Cooling Jacket Heaters are available in a sturdy construction that ensures optimum performance for longer period of time. These Cooling Jacket Heaters are leak proof and ensure uniform temperature control. Leakage Proof Cooling Jacket Heaters are designed for cooling on extrusion and blow moulding machines efficiently.